code: def test_substitute(self):
      texts = ["The quick brown fox jumps over the lazy dog"]
  
      aug = naw.SpellingAug(
          dict_path=os.path.join(self.model_dir, "spelling_en.txt")
      )
  
      for text in texts:
          self.assertLess(0, len(text))
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
  
          self.assertNotEqual(text, augmented_text)
  
      self.assertLess(0, len(texts))
  
file_path: nlpaug/test/augmenter/word/test_spelling.py
imports: import unittest
  import os
  from dotenv import load_dotenv
  import nlpaug.augmenter.word
label_desc: Use image node_id 4 for calling the TestSpelling obj's underlying member method code with example usage: obj.test_substitute() without return types